Why Build a Home Addition in Portland?

In a city known for charming homes and limited lot space, home additions in Portland are a smart way to gain square footage without moving. Whether you need a spacious kitchen expansion, a new primary suite, or want to add a second-story, we can help you grow your home with care and craftsmanship.

At Lamont Bros., we work with the unique challenges of Portland homes—tight footprints, older plumbing and framing, and strict zoning rules. Our team brings experience, precision, and creativity to every addition.

 

Top Reasons Portland Homeowners Add Space

  • Expand without leaving the neighborhood they love

  • Make room for a growing family or multigenerational living

  • Create a functional home office or guest suite

  • Boost property value with smart, high-ROI design

 

Common Types of Home Additions in Portland

  • Ground Floor Expansions
  • Primary Suite Additions
  • Second Story Additions
  • Kitchen Expansions

How Much Do Home Additions Cost in Portland? 

Depending on size and complexity, most home additions in Portland cost between $100,000 and $400,000.

  • Smaller additions: $100K–$175K

  • Kitchen or primary suite additions: $175K–$275K

  • Second-story or large-scale additions: $250K–$400K+

 

Want a personalized estimate? Try Our Home Addition Cost Calculator

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See Why We're Portland's Favorite Home Addition Contractor

Building a custom home addition in Portland is made easy with our design-build process. 

 

Addition vs. ADU vs. Whole Home Remodel

Many Portland homeowners want a home addition in order to add space. But there are a few smart ways to get there, depending on your lifestyle and goals. 

 

Home Additions are best for: 

  • Families who need more square footage

  • Homeowners who love their neighborhood but have outgrown the house

  • Projects like kitchen expansions, primary suites, or second-story builds

 

ADUs are best for: 

  • Homeowners planning for aging parents or young adult kids

  • Anyone wanting flexibility and privacy in a separate unit

  • Portlanders interested in rental income or long-term property value
  • Explore your options on our Portland ADU Construction page

 

Whole Home Remodels are best for: 

  • Homes with outdated layouts, finishes, or closed-off floorplans

  • Homeowners who want a more functional home without adding much square footage
  • Projects where multiple areas need improvement at once
  • See more on our Portland Whole Home Remodel page

Custom Portland Home Additions

These additions across the Portland metro area include second-story additions, basement build-outs, built extra bathrooms, and more. 

More Projects
Garden Home Whitford Kitchen Addition
Kitchen

Garden Home Whitford Kitchen Addition
Portland Garage Conversion
Addition

Portland Garage Conversion
Oregon City Mother In Law Suite Addition
Addition

Oregon City Mother In Law Suite Addition
A Chef's Kitchen
Kitchen

A Chef's Kitchen
Hillsboro Second-Story Addition
Addition

Hillsboro Second-Story Addition

Damascus Single-Level Home Addition
Addition

Damascus Single-Level Home Addition

The Lamont Bros. Difference

1

Project Per Superintendent

Your superintendent has one focus – your project is their priority.

2

Days Average Schedule Variance 

Last year we finished projects within two days of the original completion date.

5%

Start-to-Finish Cost Variance

We pride ourselves on providing accurate budgets without surprises, routinely completing projects within 5% of budget.